FreeNAS
FreeNAS is a free, open-source operating system for NAS (network-attached storage), developed in 2005 by Olivier Cochard-Labbé. Based on FreeBSD, it uses ZFS to provide flexible, fault-tolerant RAID (redundant array of independent disks), and a web interface for remote administrative control of the server. It can boot from a fixed disk, or from a removable device, such as a USB (universal serial bus) flash drive. A plug-in architecture enables the user to customize what types of data services are provided by the server.
In March 2020, iXsystems announced they were combining the FreeNAS and TrueNAS operating systems, essentially merging FreeNAS into TrueNAS. TrueNAS 12.0 CORE was released in October 2020 as the first version with a FreeNAS and TrueNAS combined code base.